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                [Usaco2005 mar]Space Elevator 太空电梯                </h1>
                <p>时间限制：5s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：64MB</p>			</div>
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                                <h3>题目描述</h3><p><p><span style="font-size: medium">The cows are going to space! They plan to achieve orbit by building a sort of space elevator: a giant tower of blocks. They have K (1 &lt;= K &lt;= 400) different types of blocks with which to build the tower. Each block of type i has height h_i (1 &lt;= h_i &lt;= 100) and is available in quantity c_i (1 &lt;= c_i &lt;= 10). Due to possible damage caused by cosmic rays, no part of a block of type i can exceed a maximum altitude a_i (1 &lt;= a_i &lt;= 40000). Help the cows build the tallest space elevator possible by stacking blocks on top of each other according to the rules. </span></p>
<div><span style="font-size: medium">牛们要到太空去了！他们打算建造一座太空电梯来送他们进入轨道．</span></div>
<div><span style="font-size: medium">有K(1&le;K&le;400)神方块，第i种有一个特定的高度hi(l&le;hi&le;100)，一定的存量ci(l&le;ci&le;10).为防宇宙射线的破坏，第i种方块的任何部分不能超过高度ai(l&le;ai&le;40000)．</span><span style="font-size: medium">&nbsp;请用这些方块堆出最高的太空电梯．</span></div></p><hr/><h3>输入格式</h3><p><p>* Line 1: A single integer, K * Lines 2..K+1: Each line contains three space-separated integers: h_i, a_i, and c_i. Line i+1 describes block type i.</p>
<div>&nbsp;</div>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;第1行输入一个整数K.</span></div>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;接下来K行，每行输入三个整数hi，ai，ci．</span></div></p><hr/><h3>输出格式</h3><p><p>* Line 1: A single integer H, the maximum height of a tower that can be built</p>
<div>&nbsp;</div>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;一个整数，表示最大高度．</span></div></p><hr/><h3>样例输入</h3><pre>3
7 40 3
5 23 8
2 52 6

</pre><hr/><h3>样例输出</h3><pre>48
从底部开始，先放3个方块2，之后3个方块1，接下来6个方块3．不能把3个方块1堆到4个方
块2上，因为这样最高的方块1的顶部高度超过了40.
</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Gold</p>
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